http://www.nrel.gov/otec/what.html
This is a link to an interesting article about ocean thermal energy.

http://www.need.org/needpdf/SecThermalEnergyPuttoWork.pdf
This is a link to a lab activity, I havent tried it but it looks fun.

http://www.lexington1.net/technology/instruct/ppts/Science/Physical/Thermal%20Energy.ppt
This is a powerpoint on a website, its pretty cool.

http://school-for-champions.com/science/thermal_energy.htm
This link is a cool place to go, its for kids and has some good info.

http://www.newton.dep.anl.gov/askasci/gen99/gen99829.htm
This is a link to a conversation between a student and some scientists. If you have nothing to do, read this, it might help on a test.